Decorative cup



FIG. 1 is a top perspective view of a decorative cup showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is an elevational view thereof, it being noted that the side opposite is identical to the side shown in FIG. 4; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a decorative cup, as shown and described. 